Cylinder-trip mechanism



June 8,1926. 1,587,502

J. R. BLAINE E AL CYLINDER TRIP MECHANISM Filed Nov. 17, 1922 3 Sheets-Sheet l 1 I J f/ 25 J Q7 25 June 8 1926. 1,587,502

J. R. BLAINE 1- AL, v CYLINDER TRIP MECHANISM Filed Nov. 17, 1922 3 Sheets-Sheet 2 June 8 1926. 1,587,502

J. R. BLAINE E AL CYLINDER TRIP MECHANISM Filed Nov. 17, 1922 3 Sheets-Sheet 5 I lam 242452422725 6/ 272 Jacobao/z;

Patented June 8, 1926.

UNITED STATES JosnrII R. BLAINE, or O K PARK, AND ARTHUR G. JAcoRsoN, OF CHICAGO, ILLINOIS, ssIGNORs T0 MIEI-ILE PRINTING rREss 6: MANUFACTURING COMPANY, on CHICAGO, ILLINOIS, A cORPORA'rION OF ILLINOIS.

. OYLINDRRNRIP MnOIaANIsM.

Application fil ed November 17, 1522. Serial NO. 601,464.

This invention relates to a cylinder trip mechanism for printing presses and 18 an improvement of the trip mechanism d sclosed in the Blaine Patent No. 1,408,067, granted February 28, 1922.

One object Of-the invention is to simplify and improve the cylinder trip mechanism disclosed in said patent.

Another object is to provide a simple durable and efficienttrip mechanism Whereby the blanket cylinder may be moved positively. out ofengagement with the Plate and impression cylinders when a control member ismoved to one position and whereby said blanket cylinder may be moved positively into engagement with said plate and impression cylinders when the same control member ismoved into another position.

Another objectis to provide cylinder trip mechanism'in which the movements of the' blanket cylinder with respect to the plate and impression cylinders are positive and timed in a manner tomeet the various requirements for successful commercial operation.

These and other objects are accomplished by means of the-arrangement disclosed on the accompanying sheets of drawings; in

1 which 2 Figure 1 is a fragmentary side'elevation of an offset printing press embodying our invention and showing the trip mechanism in a position whereby the blanket cylinder is maintained in engagement with the plate and impression cylinders; I

Figure 2 isa' fragmentary end elevation of the arrangement shownin Figure 1; and

Figure 3 is a fragmentary side elevation of the same offsetpress as shown in Figure 1 with the control parts in a position to maintain the blanket cylinder out ofengagement with the plate. and impression cylinders. I i

The various novel features of the invention will be apparent from the following description anddrawings, and will be particularly pointed out in the appended claims.

Referring'to the figures of the drawings it will be noted that we have disclosed our invention in connection with an offset type of printing press including a plate cylinder 10, blanketcylin'der 11 andimpression cylinder 12. As is well understood in the art, it is desirous at times to move the blanket at the last moment that the sheet being fed.

is notin register, thereby making it possible to pass thesheet through the press without giving the sheet an lmpression.

To move the blanket cylinder out of en'- gagement with the plate and impression. cylder'sor, in other words, to trip the blanket cylinder, thelatter has its bearings in" bearing blocks eccentrically mounted. One-of the eccentric bearings 13 is operatively connectedto a crossrocker shaft 15 through a:

rod 14: and anarm IG fast on the shaft 15, so thatlwhen the rocker shaft 15 is rocked in a clockwise direction from the i position shown in Figure 1 to the position shown in Figure 3, the blanket cylinder 11 will be tripped or moved out of engagementwith the plate and impression cylinders. l/Vhen the rocker shaft 15 is moved in a counterclockwise direction from the position shown in Figure 3 to the position, shown in Figure 1, the blanket cylinder willbe moved from its tripped position back into operative engagement with the plate and impression cylinders 10 and 12 respectively. Fixed to the same rocker shaft 15 is an arm 17 to which one end of a bar 18 is pivoted at 19. The rocker shaft 15. receives its rocking movement, and accordingly the blanket cylinder 11 receives its movements into and (out of engagement with respect to the plate and impression cylinders, through the bars 18, the latter in turn receiving its motion indirectly from a cam 20 formed in the blanket cylinder. Cooperating with the cam 20 is a roller 21 mounted in the free end of an arm 22 of a bell crank lever 23 pivotally connected to the press frame member 24 at 25.. I The other" arm 26 of the bell crank lever 23 has at its free end a roller 27 which underlies and supports t-heouter free end of the bar 18L Pivotally mounted on the arm 26 at 28, is a double ended pawl 290ne end 30. of which cooperates with a shoulder 31 on thebar 18 and the other end'32 of which cooperates with another shoulder 33 on said bar 18 for transmitting motion in one direction or the other from said bell crank lever 23 to the bar 18. The shoulders 31 and 33 are formed by providing the bar with a slot 34.

The double ended pawl 29 is controlled from a pedal 35 which is fixed to a shaft 36. Also fixed to the shaft 36 is a lever arm 37 pivotally connected at 38 to one end of a link 39, the other end of which link is pivotally connected at 1:0 to one arm 41. of a bell crank lever 42 pivoted on a shaft or support 13. The other arm 44: of the bell crank lever 42 has connected at its free end a block 1-5 which is slidably mounted upon a rod 4-5. Inter 70S6fl between the block 45 and an abutment 4 7 is a coiled spring 48 and interposed between said block and another abutment 49 on said rod 46 is another coiled spring 50 whereby the pawl 29 is yieldably pressed into its different operative positions with respect to the bar 18. Pivotally connected at 51 to the lever arm 52, is a rod 53 which may be reciprocated in a guide bearing 58 and surround ing the rod 53 is a coiled spring 56 which cooperates with an abutment 57 fixed to the rod and the bearing 58 through which the rod slides. A set collar 55 is provided to limit the position of pedal 35.

As mentioned above, the blanket cylinder 11 is in engagement with the plate and the impression cylinders as shown in Figure 1. If it is desired to move said blanket cylinder out of engagement with respect to said plate and impression cylinders or, in other words, to trip the blanket cylinder, the same may be accomplished by depressing the pedal 35 from the position shown in Figure 1 to the position shown in Figure 3, which causes the pawl end 30 to be withdrawn from its shoulder 31 and causes the pawl end 32 to move into engagement with the shoulder 33, whereupon, through the action of the cam 20. bell crank lever 23, pawl end 32, shoulder 33 and bar 18, and other parts described, the eccentric bearing 13 is actuated in a manner to positively trip the blanket cylinder or move it out of engagement with the inders.

If the pedal 35 were depressed at the time when the pawl cut 32 was located outwardly from the shoulder 33, toward the free end of bar 18, the pawl end 32 would slide over the bar 18 until the pawl end 32 was yieldably pressed into engagement with the shoulder 33 by the coiled spring 48; When the pedal 35 is depressed the coiled spring 56 accordingly is compressed for storing energy therein. Accordingly, when the pedal 35 is released the spring 56 is effective for raising the pedal 35 and moving the pawl end 32 out of engagement with the shoulder 33 and moving the pawl end 30 into engagement with the shoulder 31, whereupon the cam 20 is effective for rockplate and impression cyling the eccentric bearing 13 in a manner to move the blanket cylinder into engagement with the plate and impression cylinders. Here again if the pawl end 30 is not in a position immediately to engage the shoulder 31, the pawl end 30 will be yieldably forced into engagement with the shoulder 31 by the spring 50 when the pawl end 30 moves into register with the shoulder 31. It will be understood that after one pawl end has become effective for positively transmitting a movement to the bar 18 for tripping the blanket cylinder 11 or moving the cylinder back into engagement with its associated cylinder, said pawl end will be rceiprocated back and forth in the slot 341 as a result of action of cam 20. It also will be understood, that when the blanket cylinder is moved positively into one position or another, it remains there until another control movement is made.

By means of the mechanism described, the blanket cylinder is positively controlled and moved and has its movements timed accurately with respect to the plate and impression cylinders when moved into its two positions.

It is our intention to cover all modifications of the invention falling within the spirit and scope of the following claims.

lVe claim 1. In a printing press, the combination with plate, blanket and impression cylinders, of means for moving said blanket cylinder into and out of engagement with said plate and impression cylinders including a member transmitting such movements to said blanket cylinder, an actuating lever supporting one end of said member, and a double pawl carried by said lever for providing a selective operative connection between said motion transmitting member and actuating lever.

2. In a printing press, the combination of a cylinder movable between operative and tripped positions, motion transmitting means including a bar having a slot therein whereby shoulders are provided, an actuating lever supporting said bar, and a double pawl carried by said actuating lever and engagealole with the shoulders on said bar for actuating the latter in different directions directions whereby the cylinder is moved in different directions, said pawl being movable in said slot after causing movement of said cylinder in a given direction.

3. In a printing press, the combination of a cylinder movable between operative and tripped positions, motion transmitting means including a bar having a slot therein whereby shoulders are provided, an actuating lever supporting said bar, a double pawl carried by said actuating lever and engageable with the shoulders on said bar for actuating the latter in opposite directions whereby the Lil directions whereby the cylinder is moved in opposite directions, said pawl being movable in said slot after causing movement of said cylinder, and control'means whereby yieldable pressure is placed upon said pawl for connecting it with said bar to make the mo tion transmitting connection in a timed order.

Signed at Chicago, Illinois this 3rd day of November, 1922.

JOSEPH R. BLAINE. ARTHUR G. JAGOBSON. 

